package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    public void addToCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //判断插入购物车中的商品是否存在 存在,则数量加1
        if(list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            Integer number = cart.getNumber();
            cart.setNumber(number + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else { //如果不存在,则插入购物车
            Long dishId = shoppingCart.getDishId();
            if(dishId != null) {
                //添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }
            else {
                //添加到购物车的是套餐
                Long setmealId = shoppingCart.getSetmealId();
                shoppingCart.setName(setmealMapper.getById(setmealId).getName());
                shoppingCart.setImage(setmealMapper.getById(setmealId).getImage());
                shoppingCart.setAmount(setmealMapper.getById(setmealId).getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> list() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        return shoppingCartMapper.list(shoppingCart);
    }

    /**
     * 删除购物车中的一个商品
     * @param shoppingCartDTO
     */
    public void delete(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if(list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            Integer number = cart.getNumber();
            if(number > 1) {
                cart.setNumber(number - 1);
                shoppingCartMapper.updateNumberById(cart);
            }else {
                shoppingCartMapper.deleteById(cart.getId());
            }
        }
    }

    /**
     * 清空购物车
     */
    public void clear() {
       shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }
}
